The invention discloses an injection device of an injection moulding machine for perfume atomizer pistons, which comprises a support, a strut and an air outlet, wherein the support is fixedly arranged at the top end of a moving die, the strut is arranged on the support, the air outlet is arranged at an end of the strut, the air discharge end of the air outlet is arranged downwards and is close to an end of the moving die, the air outlet is communicated with an air outlet pipe, and the air outlet pipe is provided with an electromagnetic valve. After the die is opened, the electromagnetic valve on the air outlet pipe is started, and a high-pressure air flow in the air outlet pipe blows to the moving die and a stationary die by the air outlet, so that the high-pressure air flow blows off an atomizer piston adhered to the stationary die and/or the moving die due to static electricity. By using the injection device of an injection moulding machine for perfume atomizer pistons, disclosed by the invention, the blanking is thorough, and the forming rate is improved.